science

Klebsazolicin

Klebsazolicin is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Klebsazolicin rather than just read about it. In short: Klebsazolicin (KLB) is a peptide antibiotic encoded in the genome of a gram-negative bacterium Klebsiella pneumoniae subsp. ozonae and targeting prokaryotic ribosome. Klebsazolicin is a ribosomally synthesized and post-translationally modified peptide (RiPP) and a linear azol(in)e-containing peptide (LAP).

Key takeaways

Klebsazolicin belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Klebsazolicin to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Klebsazolicin from memory before moving on to harder problems.

Reference excerpt

Klebsazolicin (KLB) is a peptide antibiotic encoded in the genome of a gram-negative bacterium Klebsiella pneumoniae subsp. ozonae and targeting prokaryotic ribosome. Klebsazolicin is a ribosomally synthesized and post-translationally modified peptide (RiPP) and a linear azol(in)e-containing peptide (LAP).

Discovery The discovery of KLB represents an example of a “genome mining” approach. Cluster of genes encoding KLB biosynthetic pathway was found in genome database using low-level homology of one of the proteins to microcin B17 synthetase. Cloning and expression of cluster in a heterologous host (Escherichia coli) yielded the active compound. The name given to the compound reflects the original bacterium where the biosynthetic cluster was found (Klebs-) and the presence of azole cycles (-azolicin).

Structure The structure of KLB was established by a combination of mass-spectrometry and NMR methods. Klebsazolicin is 23-aminoacid long peptide, containing four azoles (3 thiazoles and an oxazole) and an N-terminal lactamidine ring. The latter is formed by a linkage between two N-terminal amino acids (serine and glutamine) and is absolutely essential for bioactivity.

Activity Klebsazolicin is active against Gram-negative bacteria closely related to Klebsiella, such as Escherichia coli, Klebsiella pneumoniae, and Yersinia pseudotuberculosis. KLB inhibits protein synthesis on the prokaryotic ribosome by binding to and blocking peptide exit tunnel and thus preventing the passage of the nascent peptide. The activity of KlpE export pump encoded in KLB biosynthetic gene cluster confers self-resistance of the producing bacterium to the action of the antibiotic.

Biosynthesis Typically to other RiPPs, klebsazolicin is produced in three steps. At the first step, a 47-aa precursor peptide KlpA is synthesized using cellular translation machinery. Then an N-terminal leader peptide serves as a recognition element for KlpBCD, a heterocyclase-dehydrogenase complex which converts serine and cysteine residues of KlpA into oxazole and thiazole heterocycles. Finally, the leader is cleaved off by the action of cellular proteases such as TldD/E, and at the same time KlpBCD activates the new N-terminus to form lactamidine. Thus, KlpBCD is able to introduce both azole heterocycles and lactamidine linkages, using side chains of Ser/Cys residues and N-terminal amino group as nucleophiles.

References

Illustrations

Worked examples

Example 1 — a first encounter with Klebsazolicin

Start with the simplest possible case. Write down what Klebsazolicin claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Klebsazolicin before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Klebsazolicin ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Klebsazolicin

In research: Klebsazolicin appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Klebsazolicin in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Klebsazolicin is common in secondary-school and first-year university syllabi. It links to neighbouring topics Antibiotics, Antimicrobial peptides, Hexadecapeptides, so understanding it makes those chapters shorter.
In everyday life: Look for Klebsazolicin outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Klebsazolicin in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Klebsazolicin means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Klebsazolicin out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Klebsazolicin in simple terms?

Why does Klebsazolicin matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Klebsazolicin?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Klebsazolicin.